Hi patrick8,
Welcome to the Mattress Forum! 
Just in case you haven’t read it yet … the first place I would start your research is the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones.
As you can see in the guidelines here … I would avoid any mattress where you aren’t able to find out the type and quality of the materials inside it (see this article). Making a blind purchase is a very risky choice and is one of the most common reasons for buyers remorse much too quickly after a purchase.
The better options and possibilities I’m aware of in and around the Annapolis area are included in post #2 here for the Washington, DC area and in post #2 here for the Baltimore area (with some overlap).
Phoenix